I've used the SBB mobile app for iPhone on my trip to Switzerland last September, but was never able to register an account, so I could purchase rail tickets, but only look at schedules. I'm returning in September, and trying again to register an acct. No luck. I keep getting a pop up window that says "Registration failed. Input error: Invalid input data. I'm using a yahoo.com email address, a password with small letters,caps and a numeral.